Corner lock box



E. L. ARNESON CORNER LOCK BOX Oct. 11, 1960 2 Sheets-Sheet 1 Filed Sept.2, 1958 1N VENTOR.

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Oct. 11, 1960 E. L. ARNESON 2,955,737

CORNER LOCK BOX Filed Sept. 2, 1958 2 Sheets-Sheet 2 i idwzkzl62/266073,

I CORNER LOCK BOX Edwin L. Arneson, Morris, Ill.,. assignor to FederalPaper Board Company, Inc., Bogota, N.J., a corporationofNewYork a i 7Filed Sept. 2,-1958, Ser'. N6. 758,181

1 Claim (Cl.22935 1 This invention relates to containers and is 'moreparticularly concerned with improvements in a carton which 1s adaptedfor use-in packaging various'articles of merchandise.

angles to the score lines 11 and 1 2, which score lines 11, 12, 13 and14 defineabottom forming panel in the center of the blank. The marginalportions of the blank which extend from the edges of the bottom wallpanel 15 are cut and scored so that they are adapted to hinge on thescore lines 11,12, 13Iand 14 into upstanding side and endwall formingrelation to the bot-' tomwall15. o 1' The oppositely disposed marginalportions which are separatedfrom'the bottomwall panel 15 by the score ilines 11 and 12 are-scored on thelines '16, 17 and 18,

19,1with the score lines 16,'-1 8 and 17,19 constituting aligned endextensions of the score lines13 and 14,"

respectively, to divide these portions into side wallforming panels and21 and corner connecting'flaps or panels 22; 23and 24, 25.'fIdenticallocking slits 26 are pro Itis a general object of the inventionto fabricate from a cut and creased blank of paperboard material arectangular carton' which is adapted tobe supplied to the userzin blankform andgwhich, when set up, is'strong and sturdy and presents a neatand attractiveexter'ior appearance.

It is a more specific object of the invention to provide a paperboardcarton having side and end walls which are connected at adjacent ends bylock formations which which are effectively concealedwhen the carton isclosed.

- It is a still further object of the invention to provide a paperboardcarton having side and end walls which are connected at each corner by apanel member hinged to one of these walls and foldable into faceengagement with the inside of the adjoining wall and with a slitprovided at the hinge line which is adapted to receive a hinged lockingtab provided on the end of the adjoining wall and adapted to be held inface engagement with the inside of the first wall when passed throughthe slit.

These and other objects and advantages of the invention will be apparentfrom a consideration of the carton which is shown by way of example inthe accompanying drawings wherein:

Figure 1 is a perspective view of an open top carton body whichillustrates the principles of the invention, the carton being in set upcondition;

Figure 2 is a side elevation of a corner portion of the set up carton,to a larger scale;

Figure 3 is a fragmentary section taken on the line 3-3 of Figure 2;

Figure 4 is a perspective view showing the inside of the corner portionof the carton, to an enlarged scale;

Figure 5 is a perspective view of a corner portion ofthe cartonillustrating the method of interlocking the corner connecting members;and

Figure 6 is a plan view of a paperboard blank which is cut and scored toprovide the necessary panels for fabricating the carton of Figure 1.

Referring to the drawings, there is illustrated an open top tray-likecontainer or carton body which incorporates therein the principalfeatures of the invention and which may be used in the form shown orwith a like member of slightly different size so that the two may betelescoped one within the other to form a two part telescoping box orcarton.

The illustrated carton body is fabricated from a blank 10 of paperboardor other relatively flexible material of similar character which is cutand scored. as shown in Figure 6. The blank 10 is provided with spacedparallel score lines 11 and 12 extending across the blankin 7 onedirection thereof and spaced parallel score lines 13 and 14 extendingacross the blank in a direction at right may be readily engaged, whenthe carton is set up, and

videdineach of the hinge forming s core'lin'es 16, :12 and 18, 19 whichseparate the-corner connecting panels 22, 23 and 24, 25 from the sidewall ;panels" 20 or 21. Each of thelocking slits 26has lits'rnajor'portion in the; hinge or score lineand' an end portion .27 at its innerend which inwardly a short distance into theiadjoining side wall panel.-.'Each slit -26 has an angu.*-' in: extension 28 at 'its'buter "endwhichj: is' cut a shortdistance into the adjoining corner connectingpanel. The slits 26 are identical except for being rights and lefts.

The remaining marginal portions of the blank which are in oppositelydisposed relation and which extend outp,

wardly of binge or score lines 13 and 14 are cut to form end wall panels30 and 31 which are each provided along the opposite end edges thereofwith identical locking tab formations 32, each of which is of generallytriangular shape. Each lock-ing tab 32 is connected to its end wallpanel on a hinge forming score line 33 which terminates short of theinner and outer ends of the tab. The end wall panels 30 and 31 arefreedfrom the adjoining corner connecting panels 22, 24 and 23, 25 bythe cutting lines 34, 35 and 36, 37 which are in alignment with thescore lines 11 and 12 and which extend outwardly of the ends thereof tothe score lines 33.

The cutting lines 34, 35, 36 and 37 are of a lengthcorrespondingapproximately to the width of the corner con-- necting panels or flaps22, 23, 24 and 25- so that a small triangular end'section 38 of eachlocking tab extendsv outside of the cut edge of the end wall formingpanels to which the tab is hinged and is cut from the adjoining cornerconnecting panel. At the other end of each corner connecting tab 32 aslit is cut on the line '40 tom wall forming panel 15 about the scorelines 11 and 12. The corner connecting panels 22, 23, 24 and 25 are thenfolded inwardly into approximate alignment above the hinge lines 13 and14. The end wall panels 36 and 31 are hinged upwardly about the scorelines 13 and 14 while the cornerlo cking tabs 32 are each turnedinwardly about their hinge lines 33 and the upper endportions thereofare inserted in the locking slits 26, the end panels being bowed topermit this insertion, and thecurved edges 41 facilitating the movementof the tabs 32 into the slits 26. The upper portion of each locking tab32 is moved completely through the slit 26 and then forced upwardlyalong the inner face of the adjoining side wall panel by portion 42 ofthe side. wall which is formed between the hinge line and the curvedlower endsection 27 of the slit 26. With this arrangement, the end wallpanels 30 and 31 are locked in position atrthe corners by the coneealedl ki g t bs 3.2,. witho t detrac ng rom, the

ou side app ran e of hee qn, a 7 7 1 v a The in en n i i us ra ed embode i an Open top tray-like Carton bodybut it'will be apparent that it isadapted to beincorporated in anymnlti-wall carton of this general typeand that the carton may be tirade with closure flap or'a hi e c v r onth id ndendwalls to form a completely 'closed container.

a Whil specifi m ial n Part r det il f v 5 struetiqn ve n ret red o inde q ib ng: -9 9f ea on i us i te it ll unders od th t Qther m?- toWithin he spir of. the int nti n-r terials an o he dfi ilswof cons rue in mayrbe resq t Y Iel itn:

' 'In a. ca t ha ing a bo nntwall and's deand end w lla hinged o theoppositefedg s q y ai ott w alc ner connecting structure cornprisingaconnecting panel atthe endof a sidewall which is foldablejabon-t ahinge for n- .ing crease line into inwardly extending'upstanding face aengaging relation with the adi ningre d w lL -i 91. a 1 a .7 :t

:6 tion of the hinge forming. as line, said s it ha g an necting panel,having a slit therein extending along a per upper end portion extendinga short distance laterally into diagonally downwardly into the adjoiningside wall, an

a locking tab formation of generally triangular form hinged to the endedge'of the adjoining end wall which locking tab formation is slit onthe hinge line at the top arid bottom ends thereof, the distance betweenthe end slits of the locking tab being approximately the same as thelength of the slit in therco rne r connecting panels, and

said locking tab formation having; the top of the free edge thereofcurved npwardlyin an inward direction and thendownwardly to a diagonalbottom edge portion which extends, diagonally outwardto the hinge linewhereby th e end Qwall" maybe flexed ontwardly and the locking tabformation may be passed'without folding through the slit in the learnerconne ti panel so as to be seated against thesiclewall with top andibqttom end edge por- ,tionslwhich are freed onrthe hin'ge line by theend slits therein having edge abutting engagement with the inside theconnecting panel and a lower endportion'extending 7 face ofthecornefr'connectingrpanel when the end wall is s raightened-w I r 20 jA

